106 questions · from 32 interviews · 1 asked more than once
Tekion interview questions
Every question candidates reported from their Tekion interviews, most frequently asked first. Each links to the write-up it came from, so you can see the round and how it went.
Tekion coding and DSA questions
- 01
Largest Rectangle in Histogram
Given an array of bar heights representing a histogram, find the area of the largest rectangle that can be formed within the bounds of the histogram.
Hard · Asked 2 times · From Tekion | SDE 2 Interview Experience | June 2026 | Selected
- 02
Maximum Resource Usage Over Intervals
Given multiple time intervals and the number of resources used during each interval, find the maximum total resources needed at any point in time. Intervals: [1, 4] → 3 resources [3, 5] → 2 resources [4, 6] → 4 resources Expected output: 6
Medium · From Tekion | Staff Software Engineer | Interview Experience (AI Role)
- 03
Next Greater Element
Given an array of integers, for each element find the next greater element to its right. If no such element exists, return -1 for that position.
Medium · From Tekion | SDE 2 Interview Experience | June 2026 | Selected
- 04
IPO (LeetCode 502)
Hard · From Tekion SSE Interview
- 05
Dungeon Game (LeetCode 174)
Hard · From Tekion SSE Interview
- 06
100 Lockers
Suppose you're in a hallway lined with 100 closed lockers. You begin by opening every locker. Then you close every second locker. Then you go to every third locker and toggle it - open it if it's closed, or close it if it's open. Continue this process for 100…
From Tekion | Staff Software Engineer | Interview Experience
- 07
Coin Game
A and B decide to play a coin game where each player gets a turn one by one. There is a row of even number of coins, and a player on his/her turn can pick a coin from any of the two corners of the row. The player that collects coins with more value wins the…
From Tekion | Staff Software Engineer | Interview Experience
- 08
Knapsack Problem
Solve the classic 0/1 Knapsack problem where given a set of items with weights and values, you must determine the maximum total value that fits within a weight capacity.
Medium · From Tekion-SSE
- 09
Maximum Number of Active Loans
Every funded loan is active from its disbursal day to its closure day. This represents a time window [start, end), where start is inclusive and end is exclusive. Task: Given a list of loan windows, return the maximum number of loans that are active at the…
- 10
Best Time to Buy and Sell Stocks with at Most K Transactions
You operate an orchard and have a list of apple prices over consecutive days. You can make at most K trading transactions. Each transaction consists of buying one batch of apples and later selling that batch. Rules - You must sell before buying again. - You…
- 11
Maximum Sum of a Unique-Element Subarray
Given a non-empty array of length n containing non-negative integers, find the maximum sum of a contiguous subarray such that no element is repeated within that subarray.
From Tekion Senior Software Engineer Interview Experience — Rejected in HLD Round
- 12
Koko Eating Bananas
Find the minimum eating speed such that Koko can finish all the bananas within the given number of hours. This is a standard binary search on answer problem.
From Tekion Senior Software Engineer Interview Experience — Rejected in HLD Round
- 13
Number of Islands
Given an m x n matrix containing land and water, count the number of connected islands.
From Tekion Senior Software Engineer Interview Experience — Rejected in HLD Round
- 14
Longest Balanced Substring After One Swap
Given a string, find the length of the longest substring that can become a balanced string (equal number of '0's and '1's) after swapping at most one character. This is the problem linked in the OA round.
- 15
RandomizedSet Design
Design a data structure that supports insert(val), remove(val), and getRandom() in average O(1) time. insert returns true if the element was not present, false otherwise; remove returns true if the element was present, false otherwise; getRandom returns a…
- 16
Set Matrix Zeroes
Given an m x n integer matrix, if an element is 0, set its entire row and column to 0. Do it in-place with O(1) additional space.
- 17
Shortest Subarray with Sum at Least K
Given an integer array and an integer K, find the length of the shortest, non‑empty, contiguous subarray of which the sum is at least K. If no such subarray exists, return -1. The optimal solution uses a monotonic deque; I provided a heap‑based O(n log n)…
- 18
Reschedule Meetings for Maximum Free Time I
- 19
Maximum Consecutive Ones III
- 20
Coin Change
Given a set of coin denominations and a target amount, determine the minimum number of coins required to make up that amount. If it is not possible, return -1.
Medium · From Tekion Staff Engineer Interview Experience | December 2025
- 21
Single Number
Given an integer array where every element appears twice except for one element that appears once, find the element that appears only once.
Easy · From Tekion Staff Engineer Interview Experience | December 2025
- 22
Find common intervals between two sorted disjoint interval arrays
Given two arrays, each containing sorted and disjoint intervals, print the intervals that are common to both arrays. Example: - Array A: [1,5], [7,9], [9,11] - Array B: [0,4], [4,10], [11,13] Output: [1,4], [7,9], [9,10], [11,11]
From Tekion Corp || SDE 2 || Interview Experience || March 2026
- 23
Find K-th Smallest Pair Distance
Find K-th Smallest Pair Distance
- 24
Trapping Rain Water
Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.
Hard · From Tekion DSA round | 7.5 yrs experience
- 25
Find the K-th Character in String Game II
This problem typically involves a string transformation game where an initial string undergoes iterative modifications. You are given an initial string and an integer k , and the goal is to determine the k -th character of the string after a specified number…
Hard · From Tekion DSA round | 7.5 yrs experience
27 more in the Tekion write-ups.
Tekion system design questions
- 01
ChatGPT‑style Conversational Platform (LLD)
Design a ChatGPT‑style platform where users have conversations with an AI assistant. Users send messages, the AI's response streams back token by token, conversations are saved, and users can search across their chat history. The system serves many…
From Tekion | Staff Software Engineer | Interview Experience (AI Role)
- 02
AI Agent Execution Platform (HLD)
Design a platform that runs AI agents for other applications. An agent can call tools, run long (minutes to hours), and may need human approval mid‑run. Multiple agent steps can be chained into a workflow (branches, loops, fan‑out). The platform must run…
From Tekion | Staff Software Engineer | Interview Experience (AI Role)
- 03
EVAL Pipeline for RAG System
Explain how you would build an evaluation (EVAL) pipeline for a Retrieval‑Augmented Generation (RAG) system.
From Tekion | Staff Software Engineer | Interview Experience (AI Role)
- 04
Design TTL Based Caching System
Design a library for a caching system where each entry has a time‑to‑live (TTL) value. The design should include classes, interfaces, and appropriate design patterns to manage insertion, retrieval, expiration, and eviction of cached items.
From Tekion | SDE 2 Interview Experience | June 2026 | Selected
- 05
Design Food Delivery Platform
Design the high‑level architecture for a food delivery platform similar to Swiggy. Consider components such as user service, restaurant service, order management, payment processing, and handling edge cases like restaurant closure after an order is placed.
From Tekion | SDE 2 Interview Experience | June 2026 | Selected
- 06
Stock System Low‑Level Design
Design a low‑level architecture for a stock trading system, including the database schema, API endpoints, and discuss the use of the Singleton design pattern within the system.
From Tekion-SSE
- 07
Design a pipeline to merge two huge tables (100M+ records) into a NoSQL database
Given two massive tables each containing over 100 million records that continuously receive new data, design an efficient way to merge these tables and store the result in a NoSQL database. Consider the need for initial bulk loading, handling incremental…
From Tekion | SSE - Senior Data Engineer Interview Experience | Rejected after 2 rounds
- 08
Design a resilient ETL pipeline for multiple huge tables with differing update intervals
Design an ETL pipeline that efficiently loads data from several massive tables, each updated at different intervals, into a destination system. Emphasize resilience, reconciliation, and back‑fill capabilities while minimizing polling overhead. Key points…
From Tekion | SSE - Senior Data Engineer Interview Experience | Rejected after 2 rounds
- 09
Logging Framework Design
Design a logging framework similar to Log4J with different log levels (DEBUG, INFO, WARN, ERROR), logger abstraction, appenders such as console and file, log formatting, configurable behavior, extensibility for new appenders and formatters, thread-safety and…
From Tekion Senior Software Engineer Interview Experience — Rejected in HLD Round
- 10
Car Service-Center Booking System
Design a car service-center booking system where customers can search for nearby service centers, view available service slots, and book a slot for vehicle servicing, ensuring consistency during concurrent bookings and high availability.
From Tekion Senior Software Engineer Interview Experience — Rejected in HLD Round
- 11
Design Elevator System
Design the class structure and overall flow for an elevator system. Include handling of external button presses, assignment of the nearest or fastest elevator, and internal button presses. Provide class names, member variables, and method signatures.
From Tekion Staff Engineer Interview Experience | December 2025
- 12
Design URL Filtering Service
Design a service that can block or allow specific URLs. Discuss the high‑level architecture, components, and data flow. Mention possible use of an in‑memory cache implemented with a Trie data structure for fast lookup.
From Tekion Staff Engineer Interview Experience | December 2025
- 13
Kafka basics and debugging consumer not receiving messages
Discuss the basic working of Kafka and its various components. How will you debug a scenario where a producer successfully publishes messages but a consumer is unable to consume them?
From Tekion Corp || SDE 2 || Interview Experience || March 2026
- 14
Ensuring idempotency in payment retries
In a payment system, if retries occur, how will you ensure that the same payment request does not deduct the balance multiple times?
From Tekion Corp || SDE 2 || Interview Experience || March 2026
- 15
Design a food delivery system (functional & non‑functional, entities, schema)
Discuss the low‑level design of a food delivery system, covering functional and non‑functional requirements, identifying entities, and creating a schema design. Include follow‑up design questions as needed.
From Tekion Corp || SDE 2 || Interview Experience || March 2026
- 16
Indexing and sharding strategy for database tables
In the context of the food delivery system design, in which tables would you introduce indexing and sharding? Explain your choices.
From Tekion Corp || SDE 2 || Interview Experience || March 2026
- 17
Design Parking Lot
Design a parking lot system. The task was to code the outline of all necessary methods and classes.
From Tekion offer
- 18
Optimize Empty Slot Fetching in Parking Lot
Follow-up question to the parking lot design: How would you make the system fast while fetching empty slots?
From Tekion offer
- 19
Deep Dive on Redis Cache
A deep dive discussion on Redis cache, including questions like why it cannot be used in place of a primary database.
From Tekion offer
- 20
Components of Movie Ticket Booking System (HDL)
Discuss the components of a movie ticket booking system from a High-Level Design (HDL) perspective.
From Tekion offer
- 21
Database Choice for Ticket Booking System
Which database would you choose for a movie ticket booking system (e.g., MySQL, MongoDB, Cassandra, etc.) and why?
From Tekion offer
- 22
Explain CAP Theorem and DB Choice
Explain the CAP theorem and identify which aspect (Consistency, Availability, Partition Tolerance) would not be possible in the database you chose for the ticket booking system.
From Tekion offer
- 23
Design System for Continuous Data Stream
Design a system that accepts a continuous stream of data. The candidate needs to propose a solution, discussing components like event-driven pipelines, processing layers, and storage solutions, along with trade-offs. The interviewer pressed on why not use a…
From 🚀 Tekion SSE Drive (August) – My Experience (Ghosted at the End)
- 24
Food Delivery System Design
Design a Food Delivery System. This involves starting with a quick High-Level Design overview, then moving into detailed aspects such as DB schema design (including geospatial databases for nearby restaurant queries), API design, and service-level…
From 🚀 Tekion SSE Drive (August) – My Experience (Ghosted at the End)
- 25
15 more in the Tekion write-ups.
Tekion behavioural and HR questions
- 01
Issue Resolution Near Release
What will you do if you are stuck with an issue and you have release of that feature coming up in next 5 days.
- 02
Pre-Production Release Checks
What will you make sure before the production release?
- 03
Tell me about yourself
This was a standard introductory question where I was expected to present a concise overview of my background, education, and relevant experience.
- 04
Project deep dive and business aspects
The interviewer asked for a deep dive into one of my projects, followed by a discussion on its business aspects, including scalability and potential for profitability.
Tekion other questions
- 01
Parallelism vs. Concurrency
Explain the differences between Parallelism and Concurrency.
From Tekion offer
- 02
API Latency Debugging without Code Changes
“Without adding new logs or deploying changes, how would you pinpoint whether high latency is due to DB access, business logic, or network?”
- 03
Polymorphism with Code Example
Explain polymorphism and provide a code example.
From Tekion Interview Experience Software Engineer 2 Backend
- 04
Camel and Banana Puzzle
Camel and Banana Puzzle
- 05
Rope and Lighter Time Measurement Puzzle
A classic puzzle involving two ropes and a lighter. Each rope burns for exactly one hour, but their burning rates might be non-uniform. The challenge is to use these ropes and the lighter to accurately measure a specific duration of time, such as 45 minutes.
- 06
Dry Run Quicksort
I was asked to dry run the Quicksort algorithm on a specific test case to demonstrate my understanding of its execution.
- 07
What is a deadlock?
I was asked to explain what a deadlock is in the context of operating systems, including its conditions and how it can be prevented or detected.
- 08
What is indexing?
The question was about indexing in databases, covering its purpose, types, and how it improves query performance.
- 09
Four Pillars of OOPS
I was asked to explain the four fundamental principles of Object-Oriented Programming (OOPs): Encapsulation, Abstraction, Inheritance, and Polymorphism.
- 10
What is a friend function?
I had to explain the concept of a friend function in C++, including its purpose, how it's declared, and when it might be used.
Tekion interview questions FAQ
What questions are asked in Tekion interviews?
Candidates reported 106 distinct questions across 32 Tekion interviews. 52 coding and DSA questions, 40 system design questions, 4 behavioural and HR questions, 10 other questions.
Which Tekion interview questions are asked most often?
The most repeated are "Largest Rectangle in Histogram" (2 times).
How difficult are Tekion interview questions?
Of the questions candidates rated, 13% were easy, 58% medium and 29% hard.